Recently, I've collected quite a large amount of equipment and have been getting lucky with my Reward Boxes and keep switching out my upgraded Equips for them. :/ (Seems really wasteful to just use those already upgraded items as material for further upgrades...)

I'd want to Trade (or EVEN DONATE) some of these things with friends. D:

You're not alone. Everyone wants to have the game creators implement a trading system into the game, myself included. Some people have the more luck in finding the more rare items, and others have the affinity to obtain a lot of worthless items that can be used for upgrading, and this can solve it all.

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I agree entirely, however i think it's highly unlikely we'll ever see it as the only money made from this game will be from the items via the tickets, so any trading would take away the money that could be made.
Considering the game is free and really addictive i can't really begrudge it being left out.
At least the items do have a use as materials when something better comes along.